The Crystal Tree's roots are connected to Posie's roots, so if Mario whacks the tree with his Hammer, Posie will feel the pain. Although Posie requests that Mario refrain from hitting the tree, she is willing to shake a Crystal Berry free for him when he asks for one to give to Rosie.

If Mario hits her tree too many times, Posie will throw Mario out of her part of section of Flower Fields. If Mario walks back in, Posie will scream at him to get out immediately. This banning will not prove permanent, however; if Mario returns to her area five times she will eventually cave in. However, if Mario keeps hitting her tree, she will keep kicking the plumber out an infinite number of times.